Question

how much water should be mixed with 12ml of alcohol so as to obtain 12% of alcohol solution?

Answer 1

Let the volume of water to be mixed be x ml

Total volume of the mixture = (x+12) ml

If this is to be 12% alcohol solution, that means that the *mixture* contains

12% of alcohol by volume.

We know that the mixture has 12 ml of alcohol.

So, we get the equation - 12/(x+12) = 12% or 12/100

Simplifying

1%2F%28x%2B12%29+=+1%2F100

Cross multiplying

x+%2B+12+=+100

x = 88 ml

Need to add 88 ml of water to make it a 12% alcohol solution.

Answer 2

add 88 ml water to make alcohol